Question

What will happen with the copper if copper is heated in air and a black coating is formed on the copper?
A.The copper catches fire
B.The copper decomposes
C.The copper gains oxygen
D.The copper loses oxygen

Answer 1

Hint: When copper is exposed to air it reacts and can form oxide as it is a reactive element. The black copper oxide is formed when copper metal is heated and made to react with oxygen. Then copper oxide reacts with the hydrogen gas and forms the copper metal and water. When the funnel is removed from the hydrogen stream, the copper will still be warm enough to be oxidized by the air again.

Complete step by step answer:
We know that,
The black copper oxide is formed when copper metal is heated and made to react with oxygen. Then copper oxide reacts with the hydrogen gas and forms the copper metal and water. When the funnel is removed from the hydrogen stream, the copper will still be warm enough to be oxidized by the air again.
Copper oxidizes to copper When copper is heated in air, it is oxidised to copper (II) oxide and the reddish brown metal turns black as the copper is oxidised to copper (II) ions.
$2Cu+O_2\to 2CuO$
Hence the copper is changed to copper oxide.
Therefore, the copper gains oxygen in accordance with the given reaction.

So, the correct answer is Option C .

Note:
When the temperature is changed, the piping materials and tubing of copper expands and contracts. Therefore, in a copper tube system, the pipeline can buckle or bend when it expands unless compensation is built into the system. By installing expansion loops we can stop harmful stresses, buckling and bending